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1.
利用三角函数的变换关系式对三角函数积分中最常见的∫sinmxcosnxdx型、∫sinmxcosnxdx型、∫1sinmxcosnxdx型分别进行了详尽的研究  相似文献   

2.
本文利用分析方法,通过讨论辅助函数的特性,证明了几个不等式,给出了一类椭圆积分nx/2√1+k^2cos^2tdt的上界,部分地改进了有关文献的结果。  相似文献   

3.
本文给出了丢番图方程y^2=2mx^5+nx^4+2Lx^3+kx62+2tx=d^2在某种条件下整数解的存在区间。  相似文献   

4.
本文从两个方面对公式∫baf(x)dx=∫baf(a+b-x)dx的应用做了初步探讨。这两方面是:证明有关积分的等式和计算含有三角函数的积分。  相似文献   

5.
导出该类机构压力角α的函数式和基圆半径r的求解公式:tgα=[Lψ'-rsin(ψm/2-ψ)]/rcos(ψm/2-ψ);r=Lψ'cosα/sin[(α+ψm/2-ψ]。式中,α为压力角,r为基圆半径,ψm为给定的从动件最大摆角,ψ为ψm/2与偏置角之差,L为摆杆长。给出计算实例。列出有关计算公式,可用以确定结构尺寸和校验压力角值。  相似文献   

6.
本文从两个方面对公式∫(b,a)f(x)dx=∫(b,a)f(a+b-x)dx的应用做了初步探讨。这两方面是;证明有关积分的等式和计算含有三角函数的积分。  相似文献   

7.
Glass forming ability of Zr-and Fe-based alloys at quenching from melts   总被引:1,自引:0,他引:1  
0 INTRODUCTIONSincethefirstsynthesisofanamorphousphaseintheAu Sisystembyarapidsolidificationtechniquein196 0 [1,2 ] ,agreatnumberofamorphousalloyshavebeenproducedforthelastthreedecades.ItiswellknownthatFe ,Co andNi basedamorphousalloysfoundbeforere quiredhighco…  相似文献   

8.
REE characteristics and genesis of alkaline-rich porphyry, Yunnan Province   总被引:3,自引:0,他引:3  
YunnanHimalayanalkaline richporphyryisapartoftheAilaoshan Jinshajiangalkaline richintrusiverockbeltaffirmedbyTuGuangchi[1] .ItisacompoundrockbeltforitsmostrocksbelongtoalkalinerockoralkalinegranitereferredtothemagmaticseriesofDiwatype[2 ] ,andthereareal sos…  相似文献   

9.
Openlogic,developedbyLi[1],isaformalsystemformodelingthegrowingandupdatingofknowledgeandthedynamicsofformaltheories.Italsoservesasalogicalfoundationforknowledgebasemaintenanceandsoftwareevolution.Reconstructionandcognitiveprocessarethetwobasicconceptsin…  相似文献   

10.
Warmcompactionhasbeenpaidmuchattention[1 8] tosincehigherdensityferrousP Mpartscanbefabricatedatrelativelylowercost.Itiscommonlyacceptedthatthegainingreendensi tyisattributedtoloweringtheresistancetopress ingduetoslowerworkhardeningrateandlesse nessinyiel…  相似文献   

11.
0 INTRODUCTIONTheneedofdeterminationof glucoseforthemedicalpurposehasincreaseddramaticallyinthelastfew years .Awidevarietyofenzyme basedelectro chemicalbiosensorshasalreadybeendeveloped ,duetothecombinedadvantageofferedbythespecificityofbiochemicalsystem…  相似文献   

12.
测定了Li2O-BsO-SiO2系统的玻璃形成范围和结晶相,得到了等水溶性和等膨胀系数曲线。这些图解指出高化学稳定性和低膨胀系数范围仅限于高SiO2含量区。在Li2O-BaO-SiO2玻璃样品中注入不同剂量钕离子。结果表明:锂的淬取量在剂量1×10^16ins/cm^2以下明显减少,但剂量15×10^16ions/cm^2时减少量变得缓慢。  相似文献   

13.
Beingastatisticallysuboptimaltransformorfilter,thediscretecosinetransform(DCT)hasfoundwideapplicationsinspeechandimageprocessing,especiallyindatacompression,featureextraction,imagereconstructionandrecognition,anddatafiltering.Boththewellknownimagecompres…  相似文献   

14.
0 INTRODUCTIONSulfatereduction sulfideoxidation organiccom poundmineralizationisawellaccepted processforhighstrengthsulfateorganicwastewatertreatment,andinsulfatereductionunitsulfatecouldbeconvertedtosulfide (includingH2 S ,HS- andS2 - )bytheco operationofacid…  相似文献   

15.
Sincethecenter crackedcirculardiskspeci mencanbeavailabledirectlyfromrockcore ,andmixed modefracturerangingfrompuremodeⅠtoanyKⅡ/KⅠ ratiocanbeeasilyachievedusingthisgeometry ,itiswidelyusedinthemixed modefractureinvestigationofbrittlematerials .Theproblemco…  相似文献   

16.
0 INTRODUCTIONAsamajorcomponentofalaunchvehicle ,ane quipmentcabinnotonlysupportsinstrumentsforcommunication ,navigationandattitudecontrol,butalsotransferspropulsionandshockloadsfromenginetotheseinstruments .Astheseinstrumentsusuallyhavehighrequirementso…  相似文献   

17.
1 INTRODUCTIONSincetheendoflastcentury ,studiesonthe preparationand propertiesofnanometerparticleshaveattractedalotofattention .Nanometerzincoxidewithsomespecialprop ertiescouldbewidelyusedinmanyaspects,suchasautomobileindustry ,sun proofcosmet ics,photosen…  相似文献   

18.
在以第一类Chebyshev多项式Tn(X)的零点x4=cos2k-1/2nπ(k=1,2…,n)为插值节点的条件下,讨论了Grunwald插值多项式算子在L^p空间以1/√1-x^2为权函数的加权平均收敛阶。  相似文献   

19.
Asearlyasin1964,Backofenetal.believedthatundersuperplasticconditionshardlyanystrainhardeningtakesplaceduringthedeformationofmaterialbutthereisastrongstrainratehardening[1].Andtheyalsoestablishedthesemiviscosityequationσ=kεm,(1)whichindicatestherelationbetwe…  相似文献   

20.
Theseparationofgermaniumfromacidicleachliquors,especiallyinzincproduction ,hasattractedgreatattentionbecauseofitsincreasinglyimportantroleinin dustry,suchasinfraredandfiberoptics ,catalystsandsemiconductordevices.Atpresent,thebestwaytoreco vergermaniumist…  相似文献   

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